[SOLVED] MOSFET Power handling capacity

Status
Not open for further replies.
D

darryl_co

Member level 1
Joined
Feb 23, 2011
Messages
34
Helped
6
Reputation
12
Reaction score
5
Trophy points
1,288
Visit site
Activity points
1,521
In figure 2 & 3 which configuration would have higher power handling capacity?
If 3 ampere is the circuit current consumption will only 1.5A flow from high side and low side mosfet individually . Can I parallel in the H bridge configuration. Which configuration is better and why?
 

Attachments

  • 20150905_130910.jpg
    214.5 KB · Views: 88

Shouldn't we expect readable schematics?



The question isn't clear however. A full bridge and two paralleled half-bridges have same power handling, but different output voltage. Full bridge is preferably because it avoids a supply center point and respective ripple currents.
 

Audioguru said:
You need to parallel Mosfets because yours are ancient with a high on-resistance. Modern Mosfets switch much better and are cooler.
Click to expand...
I am using mosfets in parallel just to increase power handling capacity and to avoid the power handling capacity reduction due to rise in temperature . Can you please provide some modern mosfets numbers

- - - Updated - - -

Sorry for the inconvenience in reading the schematic.
 
Last edited:

The IRF3711Z Mosfet has an on-resistance of only 0.006 ohms when cool. It comes in 3 different sized packages. There are thousands of other modern Mosfets.
 

Audioguru said:
The IRF3711Z Mosfet has an on-resistance of only 0.006 ohms when cool. It comes in 3 different sized packages. There are thousands of other modern Mosfets.
Click to expand...
The IRF3711Z is a 20V mosfet, my DC supsupply is 24V. If I use 24V AC than DC would be around 35V DC so cannot use this mosfet
 

Your 24VAC center tapped transformer will have peak voltages of 17V which is dropped to plus and minus 16V (not 12V) by the bridge rectifier.
Your 15V regulators will not produce 15V with an input as low as 16V.
Your logic gates will explode and the IR2110 logic supply voltage will be too high with a 30V supply anyway.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…